引言有时要求锁相环锁定到一个短脉冲序列上。例如雷达接收机的视频输出,电视信号的同步脉冲。如果与脉冲重复频率比较,环路带宽较窄,可将其近似地看为一连续系统,用现有的锁相理论来分析环路的工作。但是通常环路带宽不能很窄,还必须考虑到环路的取样性能。具体地说就是带宽过宽时,环路会摆动而会产生稳定问题。本文说明普通的锁相环的稳定极限和稳定裕度。 Introduction Sometimes it is required that the phase locked loop be locked to a short pulse sequence. For example, the radar receiver’s video output, TV signal synchronization pulse. If compared with the pulse repetition frequency, the bandwidth of the loop is narrow, it can be regarded as a continuous system approximately, and the existing phase-locked loop theory is used to analyze the operation of the loop. However, the loop bandwidth usually can not be very narrow, and the sampling performance of the loop must also be considered. Specifically, the bandwidth is too wide, the loop will swing and will have a stability problem. This article describes the stability of the ordinary PLL limit and stability margin.